Vacuum circuit breaker

Abstract

A vacuum circuit breaker belongs to the technical field of high and medium voltage electrical equipment. Comprising a frame, an operating mechanism, an insulating pull rod connecting lever, an insulating pull rod and a plurality of vacuum arc-extinguishing chamber poles, the operating mechanism is arranged on the frame, the insulating pull rod connecting lever is rotatably arranged on the frame, one end of the insulating pull rod connecting lever is connected with the insulating pull rod, and the other end of the insulating pull rod connecting lever is connected with the operating mechanism. The operating mechanism drives the insulating pull rod to act through an insulating pull rod connecting lever so as to drive a movable contact and a static contact of a vacuum arc-extinguishing chamber pole to be connected or disconnected to realize connection or disconnection of a circuit; the vacuum circuit breaker also comprises a magnetic field generator and a sensor for acquiring a signal of the magnetic field generator; the magnetic field generator is arranged on the insulating pull rod connecting lever and synchronously moves along with the movement of the insulating pull rod connecting lever; and the sensor is arranged on the frame at a position corresponding to the magnetic field generator. The circuit breaker has the advantages of reducing measurement errors and ensuring that the circuit breaker can accurately and reliably execute the functions of opening and closing the circuit.

Description

Technical Field

[0001] The utility model belongs to the technical field of high and medium voltage electrical equipment, and in particular relates to a vacuum circuit breaker. Background Art

[0002] The operating principle of a vacuum circuit breaker is that when the moving and stationary contacts open under the action of the operating mechanism, an arc is generated between them. The high temperature of the contact surface releases vapor, and due to the special design of the contacts, a magnetic field is generated when current passes through, causing the arc to rapidly move tangentially along the contact surface. Some of the metal vapor condenses on the metal cylinder (shield), and the arc is extinguished at a natural zero crossing, and the dielectric strength between the contacts is quickly restored. Due to their numerous advantages, including small size and light weight, excellent arc extinguishing performance (strong arc extinguishing capacity and short arc extinguishing time), small contact spacing and long mechanical life, high safety due to the absence of explosive and fire-prone airflow, suitable for frequent operation and rapid arc interruption, and low maintenance, vacuum circuit breakers have gained widespread recognition in the industry and are widely used in high- and medium-voltage distribution networks. In particular, with the rapid increase in usage, the amount of maintenance and the absolute cost of maintenance have also increased annually. The vast majority of maintenance costs are consumed by regular maintenance of circuit breakers (referred to in the industry as "performance maintenance"). Frequent operation and excessive maintenance and disassembly inevitably negatively impact circuit breaker reliability. Scientifically and rationally reducing the number of circuit breaker maintenance visits is undoubtedly beneficial not only to the breaker's service life, reliability, and safety within a reasonable period, but also to saving human resources and corresponding maintenance costs. Excessive, imperative maintenance can lead to unnecessary repairs becoming necessary. Real-time online monitoring of circuit breaker operating conditions is a valuable tool for eliminating this blindness. This technology provides timely and dynamic information on the circuit breaker's operating status (i.e., operating conditions), the source of any adverse factors, and more. Leveraging this data, targeted maintenance can be a basis for scientifically sound maintenance plans or solutions, significantly improving power supply system reliability and achieving favorable economic efficiency.

[0003] Currently, there are two main monitoring measures for circuit breaker operating conditions: one is to obtain angular displacement data on the main shaft of the operating mechanism's structural system through magnetic field generators and sensors. However, since it is impossible to measure three-phase data separately, when single-phase data is abnormal, it is often impossible to accurately capture the actual fault parameters such as whether the circuit breaker has overtravel (the distance that the moving contact or static contact can move after the contacts are fully closed), whether the closing and opening speeds are within the technical range, etc., thereby causing unnecessary losses; the other is that since the angular displacement parameters of the main shaft of the aforementioned operating mechanism are measured, the characteristic parameters of the arc extinguishing chamber contacts are calculated based on the angular velocity of the main shaft. However, it is often difficult or even impossible to obtain motion transmission data from each link between the main shaft and the contacts, such as the many data from the main shaft, thick crank arm (i.e., the main shaft connecting crank arm connected to the main shaft), connecting plate, large crank arm, connecting block to the insulating pull rod used to transmit the force of the operating mechanism to the moving contact. Utility Model Content

[0004] The task of the utility model is to provide a vacuum circuit breaker which helps to convert the measurement of the angular displacement data of the main shaft into the measurement of the angular displacement data of the insulating pull rod connecting lever 3 of the transmission mechanism and reduces the measurement error by passing the measurement link between the main shaft and the insulating pull rod through the main shaft connecting crank arm and the crank arm connecting connecting rod.

[0005] The task of the present utility model is accomplished in this way: a vacuum circuit breaker includes a frame, an operating mechanism, an insulating pull rod connecting lever, an insulating pull rod and a plurality of vacuum interrupter poles, the operating mechanism is arranged on the frame, the insulating pull rod connecting lever is rotatably arranged on the frame, one end of the insulating pull rod connecting lever is connected to the insulating pull rod, and the other end is connected to the operating mechanism, the operating mechanism drives the insulating pull rod to move through the insulating pull rod connecting lever to drive the moving and static contacts of the vacuum interrupter pole to connect or disconnect the circuit, and also includes a magnetic field generator and a sensor for obtaining a signal from the magnetic field generator, the magnetic field generator is arranged on the insulating pull rod connecting lever and moves synchronously with the movement of the insulating pull rod connecting lever, and the sensor is arranged on the frame at a position corresponding to the magnetic field generator.

[0006] In another specific embodiment of the present invention, the insulating pull rod connecting lever includes a pair of connecting lever plates that are both parallel to each other and spaced apart from each other and a lever connecting shaft. The lever connecting shaft is connected to the pair of connecting lever plates at a middle position corresponding to the length direction of the connecting lever plates, and the lever connecting shaft can rotate around the lever connecting shaft.

[0007] In another specific embodiment of the present invention, the magnetic field generator is fixedly arranged at the end of the lever connecting shaft facing the sensor.

[0008] In another specific embodiment of the present invention, the operating mechanism includes a main shaft, a main shaft connecting crank arm and a crank arm connecting rod, one end of the main shaft connecting crank arm is fixed on the main shaft, the other end of the main shaft connecting crank arm is hinged to one end of the crank arm connecting rod, the other end of the crank arm connecting rod is hinged to one end of the insulating pull rod connecting lever, and the other end of the insulating pull rod connecting lever is connected to the insulating pull rod connecting piece of the insulating pull rod through a connecting pin.

[0009] In another specific embodiment of the present invention, the end portion of the lever connecting shaft facing away from the magnetic field generator passes through the rear lever piece of the pair of connecting lever pieces and the frame in sequence, and is provided with a lever piece anti-falling limiter for preventing the rear lever piece from falling off from the end portion of the lever connecting shaft.

[0010] In another specific embodiment of the present invention, the sensor is fixed to the frame at a position corresponding to the magnetic field generator through a sensor mounting plate.

[0011] In a further specific embodiment of the present invention, a retaining spring groove or a cotter pin hole is provided at one end of the lever connecting shaft facing the lever piece anti-falling limit member, and the lever piece anti-falling limit member is a retaining spring or a cotter pin, and when the lever piece anti-falling limit member is a retaining spring, the retaining spring is engaged with the retaining spring groove, and when the lever piece anti-falling limit member is a cotter pin, the cotter pin is engaged with the cotter pin hole; a lever piece shaft groove with a V-shaped cross section is provided on the lever connecting shaft and along the length direction of the lever connecting shaft, and the pair of connecting lever pieces are each wedged with the lever piece shaft groove at a position corresponding to the lever piece shaft groove by a wedging flange extending toward the direction of the lever piece shaft groove, or fixed to the lever piece shaft groove by a triangular key inserted into the lever piece shaft groove, the cross-sectional shape of which forms a compensating relationship with the lever piece shaft groove.

[0012] In yet another specific embodiment of the present invention, the sensor is a detection coil or a Hall effect sensor.

[0013] In a more specific embodiment of the present invention, the magnetic field generator is a permanent magnet or a solenoid.

[0014] In yet another specific embodiment of the present invention, the insulating pull rod connector is a connecting bolt or a connecting head.

[0015] The technical solution provided by the utility model is that the magnetic field generator is arranged on the insulating pull rod connecting lever and moves synchronously with the movement of the insulating pull rod connecting lever, and the sensor is arranged on the frame at a position corresponding to the magnetic field generator. Therefore, the measurement of the main shaft in the existing technology is changed to the measurement of the angular displacement data of the insulating pull rod connecting lever, so that the measurement link between the main shaft and the insulating pull rod is only through the main shaft connecting crank arm and the crank arm connecting rod, which can significantly reduce the measurement error and ensure that the circuit breaker can accurately and reliably perform its function of opening and closing the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A detailed structural diagram of a magnetic field generator shown is provided on a lever connecting shaft of an insulating pull rod connecting lever;

[0018] Figure 3 for Figure 2 A schematic diagram of an embodiment of a lever connecting shaft for connecting a pair of connecting lever plates is shown. DETAILED DESCRIPTION

[0019] In order to more clearly understand the technical essence and beneficial effects of the present invention, a detailed description will be given below in the form of embodiments. However, the description of the embodiments does not limit the scheme of the present invention. Any equivalent transformation that is merely formal and not substantial based on the concept of the present invention should be regarded as within the scope of the technical solution of the present invention.

[0020] In the following description, all concepts related to directionality or orientation, such as up, down, left, right, front and back, are based on the current Figure 1 The static position state is taken as an example, and therefore it cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0021] See Figure 1 A vacuum circuit breaker comprises a frame 1, an operating mechanism 2, an insulating pull rod connecting lever 3, an insulating pull rod 4, and a plurality of vacuum interrupter poles 5. The operating mechanism 2 is disposed on the frame 1, and the insulating pull rod connecting lever 3 is rotatably disposed on the frame 1. One end of the insulating pull rod connecting lever 3 is connected to the insulating pull rod 4, and the other end is connected to the operating mechanism 2. The operating mechanism 2 drives the insulating pull rod 4 via the insulating pull rod connecting lever 3 (i.e., the operating mechanism 2 drives the insulating pull rod connecting lever 3), thereby driving the moving and static contacts 51 and 52 of the vacuum interrupter pole 5 to close or open, thereby connecting or disconnecting the circuit.

[0022] The key technical features of the technical solution provided by the present invention include a magnetic field generator 6 and a sensor 7 for acquiring signals from the magnetic field generator 6 within the aforementioned vacuum circuit breaker structure. The magnetic field generator 6 is mounted on the aforementioned insulating rod connecting lever 3 and moves synchronously with the movement of the insulating rod connecting link 33. The sensor 7 is mounted on the aforementioned frame 1 at a position corresponding to the magnetic field generator 6. The combination of the magnetic field generator 6 and the sensor 7 for acquiring angular displacement signals from the insulating rod connecting lever 3, which is directly connected to the insulating rod 4, offers advantages such as accuracy, intuitiveness, and a long mechanical life.

[0023] Continue to see Figure 1 The insulating pull rod connecting lever 3 includes a pair of connecting lever pieces 31 that are both parallel to each other and spaced apart from each other, and a lever connecting shaft 32. The lever connecting shaft 32 is connected to the pair of connecting lever pieces 31 at a position corresponding to the middle of the length direction of the connecting lever pieces 31, and the lever connecting shaft 32 can rotate around the lever connecting shaft 32. The magnetic field generator 6 is fixedly arranged at the end of the lever connecting shaft 32 facing the sensor 7. As can be seen from the above description, the combination of the magnetic field generator 6 and the sensor 7 is used to collect the angular displacement signal of the insulating pull rod connecting link 33 that is directly connected (connected) to the insulating pull rod 4. Of course, the magnetic field generator 6 can be set at any position on the connecting lever piece 31 on the side facing the sensor 7, as long as it can generate a magnetic field change.

[0024] Depend on Figure 1 As shown, the operating mechanism 2 includes a main shaft 21, a main shaft connecting crank arm 22, and a crank arm connecting rod 23. One end of the main shaft connecting crank arm 22 is fixed on the main shaft 21, and the other end of the main shaft connecting crank arm 22 is hinged to one end of the crank arm connecting rod 23. The other end of the crank arm connecting rod 23 is hinged to one end of the insulating pull rod connecting lever 3, and the other end of the insulating pull rod connecting lever 3 is connected to the insulating pull rod connecting piece 41 of the insulating pull rod 4 through the connecting pin 33.

[0025] See Figure 2 And combined Figure 1 One end of the lever connecting shaft 32 toward the magnetic field generator 6 passes through the front lever piece of a pair of connecting lever pieces 31 and the aforementioned frame 1 in sequence and is provided with a magnetic field generator fixing seat 321. The magnetic field generator 6 is fixedly set on the magnetic field generator fixing seat 321. Specifically, fixing holes 3211 are spaced apart on the magnetic field generator fixing seat 321 and around the circumferential direction of the magnetic field generator fixing seat 321. The magnetic field generator 6 is fixed to the magnetic field generator fixing seat 321 at a position corresponding to the fixing hole 3211 by fasteners such as screws or other equivalent components.

[0026] The end portion (rear end portion) of the lever connecting shaft 32 facing away from the magnetic field generator 6 passes through the rear lever piece of the pair of connecting lever pieces 31 and the frame 1 in sequence, and is provided with a lever piece anti-falling limiter 322 for preventing the rear lever piece from falling off from the end portion of the lever connecting shaft 32.

[0027] Depend on Figure 2 As shown, the aforementioned sensor 7 is fixed to the aforementioned frame 1 at a position corresponding to the aforementioned magnetic field generator 6 through a sensor mounting plate 71.

[0028] See Figure 3 And combined Figure 2 In this embodiment, a retaining spring groove 323 is provided at one end (i.e., the rear end) of the lever connecting shaft 32 facing the lever piece anti-falling limiter 322. The lever piece anti-falling limiter 322 is a retaining spring, and the lever piece anti-falling limiter 322 is engaged with the retaining spring groove 323.

[0029] Of course, if the aforementioned spring groove 332 is changed into a split pin hole, and accordingly the aforementioned spring-loaded lever anti-drop limiter 322 is replaced by a split pin, then it should be considered as an equivalent technical means. Figure 3 The illustrated embodiment of the lever connecting shaft 32 having the retaining ring groove 323 replaced with a keyway and the use of a flat key to secure the rear lever piece 31 to the lever connecting shaft 32 should also be considered equivalent technical means and still fall within the technical scope of the present invention. Of course, since this embodiment is characterized by a lever piece shaft groove 324 having a V-shaped cross section formed on and along the length of the lever piece shaft 332, the lever pieces 31 are secured to the lever piece shaft groove 324 at positions corresponding to the lever piece shaft groove 324 by wedging flanges extending toward the lever piece shaft groove 324 or by a triangular key inserted into the lever piece shaft groove 324, the triangular key having a cross section that forms a compensating relationship with the lever piece shaft groove 324. Therefore, the pair of lever pieces 31 can be secured to the lever connecting shaft 32 solely by the triangular key, while the retaining ring or cotter pin serves as a precaution.

[0030] In this embodiment, the aforementioned sensor 7 is a detection coil, and of course it can also be a Hall effect sensor or other devices that can achieve the same function; the aforementioned magnetic field generator 6 is a permanent magnet, and of course a solenoid or the like can also be a Hall effect sensor or other devices that can achieve the same function; the aforementioned insulating pull rod connector 41 is a connecting bolt or a connecting head, that is, the left end of the aforementioned pair of connecting lever pieces 31 is connected to the connecting column or the connecting head, but other connectors can also be used to replace the aforementioned connecting bolt or connecting head, such as a disc spring and a nut, a pin, etc.

[0031] The main shaft connecting arm 22, the connecting arm connector 23, and the insulating rod connecting lever 3 form a transmission chain, so that they all move together, thereby causing the magnetic field generator 6, which is mounted on the insulating rod connecting lever 3, to move accordingly. This achieves the purpose of indirectly monitoring the insulating rod displacement signal through the angular displacement signal, and thus achieves the purpose of monitoring the mechanical characteristics of the circuit breaker.

[0032] The reason why the applicant mentioned multiple vacuum interrupter poles 5 above is because the present application mainly relates to three-pole circuit breakers. It is preferred that the characteristic monitoring device of the present patent be installed on all three levels. It can also be installed on any level or any two poles of the three-pole circuit breaker as needed. The installation and rotation of circuit breakers with other different numbers of poles can be carried out in this way.

[0033] Installation: Install the magnetic field generator 6 and sensor 7 described in this patent onto the circuit breaker. After installation, perform routine characteristic testing on the circuit breaker, measuring the circuit breaker's characteristic parameters using a speed sensor. Compare the speed sensor data with the angular displacement data measured by sensor 7 described in this application. If the data deviates by 5% or more, adjust the compensation parameters set in the sensor backend until the deviation is less than 5%. The circuit breaker can then be put into practical use.

[0034] Mechanical property monitoring: In actual use, during the opening and closing process of the monitored circuit breaker, the pair of connecting levers 31 rotates and drives the magnetic field generator 6 to rotate synchronously. At the same time, the sensor 7 obtains the rotation signal of the magnetic field generator 6. The user can monitor the relevant parameters of the monitored circuit breaker in real time through the background monitoring system.

[0035] In summary, the technical solution provided by the present utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. A vacuum circuit breaker, comprising a frame (1), an operating mechanism (2), an insulating pull rod connecting lever (3), an insulating pull rod (4) and a plurality of vacuum interrupter poles (5), wherein the operating mechanism (2) is arranged on the frame (1), the insulating pull rod connecting lever (3) is rotatably arranged on the frame (1), one end of the insulating pull rod connecting lever (3) is connected to the insulating pull rod (4), and the other end is connected to the operating mechanism (2), the operating mechanism (2) drives the insulating pull rod (4) via the insulating pull rod connecting lever (3) to move, thereby driving the moving and static contacts (51, 52) of the vacuum interrupter pole (5) to close or open to realize the connection or disconnection of the circuit, and is characterized in that: The invention also includes a magnetic field generator (6) and a sensor (7) for acquiring a signal from the magnetic field generator (6). The magnetic field generator (6) is arranged on the insulating pull rod connecting lever (3) and moves synchronously with the movement of the insulating pull rod connecting lever (3). The sensor (7) is arranged on the frame (1) at a position corresponding to the magnetic field generator (6).

2. A vacuum circuit breaker according to claim 1, characterized in that: The insulating pull rod connecting lever (3) comprises a pair of connecting lever pieces (31) that are both parallel to each other and spaced apart from each other, and a lever connecting shaft (32). The lever connecting shaft (32) is connected to the pair of connecting lever pieces (31) at a middle position corresponding to the length direction of the connecting lever pieces (31). The lever connecting shaft (32) can rotate around the lever connecting shaft (32).

3. A vacuum circuit breaker according to claim 2, characterized in that: The magnetic field generator (6) is fixedly arranged at the end of the lever connecting shaft (32) facing the sensor (7).

4. A vacuum circuit breaker according to claim 1, characterized in that: The operating mechanism (2) includes a main shaft (21), a main shaft connecting crank arm (22) and a crank arm connecting rod (23), one end of the main shaft connecting crank arm (22) is sleeved on the main shaft (21), the other end of the main shaft connecting crank arm (22) is hinged to one end of the crank arm connecting rod (23), the other end of the crank arm connecting rod (23) is hinged to one end of the insulating pull rod connecting lever (3), and the other end of the insulating pull rod connecting lever (3) is connected to the insulating pull rod connecting piece (41) of the insulating pull rod (4) through a connecting pin (33).

5. A vacuum circuit breaker according to claim 2, characterized in that: The end of the lever connecting shaft (32) facing away from the magnetic field generator (6) passes through the rear lever piece of the pair of connecting lever pieces (31) and the frame (1) in sequence, and is provided with a lever piece anti-falling limiter (322) for preventing the rear lever piece from falling off from the end of the lever connecting shaft (32).

6. A vacuum circuit breaker according to claim 1, characterized in that: The sensor (7) is fixed to the frame (1) at a position corresponding to the magnetic field generator (6) via a sensor mounting plate (71).

7. The vacuum circuit breaker according to claim 5, characterized in that: A spring groove (323) or a cotter pin hole is provided at one end of the lever connecting shaft (32) facing the lever sheet anti-falling limiter (322); the lever sheet anti-falling limiter (322) is a spring or a cotter pin, and when the lever sheet anti-falling limiter (322) is a spring, the spring is engaged with the spring groove (323); and when the lever sheet anti-falling limiter (322) is a cotter pin, the cotter pin is engaged with the cotter pin hole; ) and a lever piece shaft groove (324) with a V-shaped cross section is provided on the lever connecting shaft (32) along the length direction of the lever connecting shaft (32); the pair of connecting lever pieces (31) are respectively wedged with the lever piece shaft groove (324) at positions corresponding to the lever piece shaft groove (324) by wedging flanges extending in the direction of the lever piece shaft groove (324) or fixed to the lever piece shaft groove (324) by a triangular key inserted into the lever piece shaft groove (324) and having a cross section that forms a compensating relationship with the lever piece shaft groove (324).

8. A vacuum circuit breaker according to claim 1 or 6, characterized in that: The sensor (7) is a detection coil or a Hall effect sensor.

9. The vacuum circuit breaker according to claim 1, characterized in that: The magnetic field generator (6) is a permanent magnet or a solenoid.

10. The vacuum circuit breaker according to claim 4, characterized in that: The insulating pull rod connector (41) is a connecting bolt or a connecting head.

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